/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dx.dex.code;

import com.android.dx.rop.code.RegisterSpecList;
import com.android.dx.rop.code.SourcePosition;

/**
 * Pseudo-instruction base class for variable-sized instructions.
 */
public abstract class VariableSizeInsn extends DalvInsn {

	/**
	 * Constructs an instance. The output address of this instance is initially
	 * unknown ({@code -1}).
	 * 
	 * @param position
	 *            {@code non-null;} source position
	 * @param registers
	 *            {@code non-null;} source registers
	 */
	public VariableSizeInsn(SourcePosition position, RegisterSpecList registers) {
		super(Dops.SPECIAL_FORMAT, position, registers);
	}

	/** {@inheritDoc} */
	@Override
	public final DalvInsn withOpcode(Dop opcode) {
		throw new RuntimeException("unsupported");
	}

	/** {@inheritDoc} */
	@Override
	public final DalvInsn withRegisterOffset(int delta) {
		return withRegisters(getRegisters().withOffset(delta));
	}
}
